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- 9.16 According to Figure 9.2, the total energy supply in the United States in 2016 was 111.261015 Btu. Express this value in joules and in calories. FIGURE 9.2 Energy production and consumption (in quadrillion Btu) in the United States during the year 2016. The discussion in the text explains how to read this complex figure, which contains an enormous amount of information about the energy economy. Data come from the Department of Energy and do not always add up exactly as expected due to rounding and other issues.Swimming Pool A swimming pool measuring 20.0m12.5m is filled with water to a depth of 3.75m. If the initial temperature is 18.4°C, how much heatmust be added to the water to raise its temperature to29.0°C? Assume that the density of water is 1.000 g/mL.A piece of chocolate cake contains about 400 calories. A nutritional calorie is equal to 1000 calories (thermochemical calories), which is equal to 4.184 kJ. How many 8-in-high steps must a 180-lb man climb to expend the 400 Cal from the piece of cake? See Exercise 28 for the formula for potential energy.
- A 70.0-g piece of metal at 80.0 °C is placed in loo g of water at 22.0 °C contained in a calorimeter like that shown in Figure 5.12. The metal and water come to the same temperature at 24.6 °C. How much heat did the metal give up to the water? What is the specific heat of the metal?The combustion of one cubic foot of natural gas produces 1000. kJ of heat. Assume a 57% efficiency and determine how many cubic feet of natural gas must be burned to raise the temperature of 46 gallons of water in a hot water tank from 12.7°C to 90.0°C. Note: 1 gal = 3.79 L. (See the table.)Use the interactive to determine the specific heat of various metals. The specific heat of water is 4.184 J/g °C. Sapling Learning - °C ✔Help 0.0000 g silver Add water to the cup and heat a block of metal. Use the balance to measure the mass and the thermometer to measure the temperature. Click Reset to start over. Arrange the metals from highest specific heat to lowest specific heat. gold H₂O copper iron Highest specific heat Lowest specific heat Answer Bank Metal: Gold v Au Reset
- (Would like answers for part B ONLY please-need info from part a to answer. I already solved part a) 1)Energy Efficiency at Home: Suppose you have two kettles – a plug-in electrickettle and a stovetop kettle. The electric kettle uses electricity from a natural gas fired powerplant, while you boil water in your stovetop kettle on a natural gas burner. a)Based on the following information, which of these kettles demonstrates a higher energy efficiency (i.e., which is more efficient at using energy from fuel to heat water)? Please calculate the efficiencies of each kettle and express answers as percentages. -The natural gas power plant converts chemical energy of the natural gas to electrical energy with 58% efficiency. -High-voltage power lines from the power plant to your house convey electricity with 92% efficiency. -The electric kettle converts electrical energy to thermal energy in the water with 85% efficiency (the other 15% heats up the kettle itself). -The stove burner converts…You will find the final temperature when 5.00 grams of aluminum at 425℃ is placed in 50.0 grams of water at 19.5℃. Aluminum has a specific heat capacity of 0.900 J/g ℃. And water has a specific heat capacity of 4.184 J/g℃. (So that we do not have 8 points on one question I have broken this down into a few steps). First what is the calculator answer for the value of m Cs (mass times specific heat capacity) for the hot aluminum? Select one: a. 45 J/℃ b. none of these c. 209.2 J/℃ d. 25.104 J/℃ e. 3.6 J/℃ f. 16.736 J/℃ g. 4.5 J/℃ h. 20.92 J/℃ i. 5.4 J/℃Specific Heat Metal (J/g°C) Calcium 0.647 Iron 0.449 Silver 0.235 Gold 0.129 Ten grams of all four substances above are pulled from the same container of hot oil with a temperature of 250°C. Determine which substance will cool off fastest and explain how you know. Edit Viow Incert Format Teels Table hp
- The following statements/concepts describe thermochemical equations correctly EXCEPT ____________. The loss or gain in heat energy is always equal to the enthalpy. States of matter must always be written and indicated in thermochemistry. The coefficients always represent the number of moles in a stoichiometric equation. Breakage of bonds such as the melting of ice is endothermic, absorbing heat from surroundings.ellus_engine.html?ClassID=1463972376# The water absorbs about 2100 J and the cup absorbs about 13 J of energy. The energy for the system to reach 20.5 °C is supplied by a chunk of hot metal. What is the heat change for the metal? ametal = [?] J 1 Enter either a + or - sign AND the magnitude. q, metal (J) EnterUse the References to access important values if needed for this question. In the laboratory a student finds that it takes 706 Joules to increase the temperature of 13.3 grams of liquid water from 23.0 to 36.4 degrees Celsius. The specific heat of water calculated from her data is J/g°C. Submit Answer Try Another Version 1 item attempt remaining Visited Previous Next Cengage Learning | Cengage Technical Support 10 10 MAR étv 27 MacBook Air